If you drew magnetic field lines for this bar magnet, which statement would be true.

a. the magnetic field lines run parallel to the magnet.
b. field lines loop around the magnet starting at the north pole and ending at the south pole.
c. the field lines start at the south pole and wrap around the north pole.
d. some lines leave the north pole and some lines leave the south pole. they make straight line paths away from the magnet.

B. Field lines loop around the magnet starting at the north pole and ending at the south pole.

Explanation:

A magnet has two poles: North pole and South pole. Magnetic field lines are imaginary lines where magnetic force is exerted. Magnetic field lines form closed loops around the magnet. These lines start from North pole and terminate at south pole. The strength of the magnet is maximum near the poles. The lines are unique and do not cross each other.

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)